Change dashboard to support showing scores as of arbitrary wpt.fyi run (or latest run) even if not all browsers have results for that run

Right now, https://wpt.fyi/interop-2023 seems to show scores as of the latest run (from https://wpt.fyi/runs ) that has results for all browsers, I think. This often means that it's showing you results that are a day or so out of date, since these results-for-all-browsers runs are relatively infrequent.

It would be really useful to be able to be able to request that the dashboard show me results for the most recent run (even if it's missing data for some browser(s)), or for a particular run based on the SHA value shown on https://wpt.fyi/runs (included as a parameter in the URL, for example).

wpt.fyi already supports this for its regular presentation of test results, e.g. here's a run that I have in my history (which happened to only have results for Chrome and Firefox):
https://wpt.fyi/results/css/motion/animation/offset-interpolation.html?sha=ad172b15c6&label=master

So it would be great to support this on the interop-2023 dashboard as well.

Start by comparing the Interop 2023 dashboard at wpt.fyi/interop-2023 with the run selector and the regular results URL using a sha parameter. The change is complete when the dashboard can show the latest run or a selected run by SHA, including runs where some browsers have no results.